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Simplifying b + 2(-2 + -1b) = 21 b + (-2 * 2 + -1b * 2) = 21 b + (-4 + -2b) = 21 Reorder the terms: -4 + b + -2b = 21 Combine like terms: b + -2b = -1b -4 + -1b = 21 Solving -4 + -1b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1b = 21 + 4 Combine like terms: -4 + 4 = 0 0 + -1b = 21 + 4 -1b = 21 + 4 Combine like terms: 21 + 4 = 25 -1b = 25 Divide each side by '-1'. b = -25 Simplifying b = -25
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